Charging circuit and AR glasses

Abstract

The embodiment of the invention provides a charging circuit and AR glasses. The charging circuit comprises a voltage conversion module, a step-down charging integrated module and a power line connected between the output end of the voltage conversion module and a bus voltage input port of the step-down charging integrated module. The output end of the voltage conversion module is connected with a system, and when the input end of the voltage conversion module receives a power supply voltage, the voltage conversion module converts the input power supply voltage into a main power supply voltage required by the system and provides the main power supply voltage to the system and the step-down charging integrated module through the power supply wire; the step-down charging integrated module converts the voltage of the main power supply into the voltage of the battery required by the battery so as to supply power to the system and the battery. Compared with the existing two paths of power supply wires, the voltage conversion module is additionally arranged, and only one path of power supply wire needs to be arranged between the output end of the voltage conversion module and the bus voltage input port of the step-down charging integrated module, so that the number of the power supply wires in the flexible circuit board is reduced, and the layer number of the flexible circuit board is reduced.

Description

Technical Field

[0001] This application relates to the field of AR glasses, and more particularly to a charging circuit and AR glasses. Background Technology

[0002] AR glasses are influenced by their product form, with the main board and Type-C interface usually on one side, and the small board and battery on the other side, connected in the middle by a flexible circuit board.

[0003] While accommodating multiple functions such as camera shooting, screen display, Bluetooth audio and video playback, and Wi-Fi internet access, AR glasses products are usually subject to significant limitations in size and weight.

[0004] In order to maximize the use of space in eyeglasses, the flexible circuit board connecting the left and right temples needs to support more components and traces, which leads to an increase in the number of layers of the flexible circuit board and hinders the development of flexible circuit boards towards being lighter, thinner and narrower. Summary of the Invention

[0005] This application provides a charging circuit and AR glasses, which reduces the number of power traces in the flexible circuit board, reduces the number of layers in the flexible circuit board, and promotes the development of flexible circuit boards towards being lighter, thinner, and narrower.

[0006] In a first aspect, embodiments of this application provide a charging circuit, including:

[0007] A voltage conversion module; the output terminal of the voltage conversion module is connected to the system, and when the input terminal of the voltage conversion module receives the input power supply voltage, the voltage conversion module is used to convert the input power supply voltage into the main power supply voltage required by the system.

[0008] The power supply trace is connected between the output terminal of the voltage conversion module and the bus voltage input port of the buck charging integrated module;

[0009] The buck charging integrated module is also included; the battery port of the buck charging integrated module is connected to the battery, and when the bus voltage input port of the buck charging integrated module receives the main power supply voltage, the buck charging integrated module is used to convert the main power supply voltage into the battery voltage required by the battery.

[0010] Optionally, the buck charging integrated module further includes: a system voltage output port; the system voltage output port is connected to the power supply line;

[0011] When the battery port of the buck charging integrated module receives the battery voltage provided by the battery, the buck charging integrated module is used to convert the battery voltage into the main power supply voltage, and the system voltage output port outputs the main power supply voltage;

[0012] And / or, when the bus voltage input port of the buck charging integrated module receives the main power supply voltage, the system voltage output port outputs the main power supply voltage.

[0013] Optionally, the charging circuit further includes: a switching module; the switching module is connected between the power supply line and the bus voltage input port of the buck charging integrated module;

[0014] When the control terminal of the switching module receives the input power supply voltage, the switching module is turned on to transmit the main power supply voltage output by the voltage conversion module to the buck charging integrated module.

[0015] Optionally, the charging circuit further includes: a unidirectional conduction module; the input terminal and control terminal of the unidirectional conduction module are connected to the system voltage output port of the buck charging integrated module, and the output terminal of the unidirectional conduction module is connected to the power supply line;

[0016] When the unidirectional conduction module receives the main power supply voltage, the unidirectional conduction module is turned on to transmit the main power supply voltage to the system.

[0017] Optionally, the unidirectional conduction module includes: a diode;

[0018] The control terminal of the diode serves as the control terminal of the unidirectional conduction module, the anode of the diode serves as the input terminal of the unidirectional conduction module, and the cathode of the diode serves as the output terminal of the unidirectional conduction module.

[0019] Secondly, this application provides AR glasses, including the charging circuit described in the first aspect.

[0020] Optionally, the AR glasses also include a flexible circuit board, and the power traces in the charging circuit are disposed on the flexible circuit board.

[0021] Optionally, the AR glasses further include: a USB port; the USB port is connected to the input terminal of the voltage conversion module in the charging circuit;

[0022] And / or, the motherboard; the voltage conversion module in the charging circuit and some functional modules of the system are located on the motherboard.

[0023] Optionally, the AR glasses further include: a small board, on which the buck charging integrated module and some functional modules of the system are disposed;

[0024] And / or, the battery connected to the battery port of the buck charging integrated module.

[0025] Optionally, the AR glasses may also include a left temple, a right temple, and a frame;

[0026] The motherboard and the USB interface are located on the right temple of the mirror.

[0027] The small plate and the battery are located on the left temple;

[0028] The flexible circuit board is located on the mirror frame.

[0029] The charging circuit and AR glasses provided in this application include a voltage conversion module, a buck charging integrated module, and a power trace connecting the output terminal of the voltage conversion module and the bus voltage input port of the buck charging integrated module. The output terminal of the voltage conversion module is connected to the system. When the input terminal of the voltage conversion module receives the power supply voltage, the voltage conversion module converts the input power supply voltage into the main power supply voltage required by the system, and provides the main power supply voltage to the system and the buck charging integrated module through the power trace. The buck charging integrated module converts the main power supply voltage into the battery voltage required by the battery, thereby powering the system and the battery. Compared with the existing two power traces, by adding a voltage conversion module, only one power trace needs to be set between the output terminal of the voltage conversion module and the bus voltage input port of the buck charging integrated module, reducing the number of power traces in the flexible circuit board and reducing the number of layers of the flexible circuit board. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0031] Figure 1 This is a schematic diagram of a charging circuit.

[0032] Figure 2 This is a schematic diagram of the structure of an AR glasses;

[0033] Figure 3 A schematic diagram of the charging circuit provided in this application;

[0034] Figure 4 This is a schematic diagram of the structure of the AR glasses provided in this application;

[0035] Figure 5 This is a schematic diagram of the structure of the AR glasses provided in this application.

[0036] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0037] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0038] AR (Augmented Reality) glasses, as human-computer interaction devices, are widely used in consumer electronics, industrial assistance, medical and health care, education and entertainment and other fields.

[0039] Key components of AR glasses include the main board, Type-C interface, flexible printed circuit (FPC), sub-board, and battery.

[0040] AR glasses are influenced by their product form. Typically, the main board and Type-C interface are on one side, and the small board and battery are on the other side. They are connected in the middle by a flexible circuit board, which spans the frame and connects the left and right temples.

[0041] While accommodating multiple functions such as camera shooting, screen display, Bluetooth audio and video playback, and Wi-Fi internet access, AR glasses products are typically subject to significant limitations in size and weight. To maximize the use of space within the glasses, the flexible circuit board connecting the left and right temples needs to accommodate more components and wiring.

[0042] Combination Figure 1 and Figure 2 As shown, the small board and battery are located on the left temple, while the main board and Type-C interface are located on the right temple. The main board is equipped with a buck charge integrated module (Buck Charge IC), which includes a bus voltage input port VBUS, a system voltage output port VSYS, and a battery port BAT.

[0043] The buck charging integrated module's bus voltage input port VBUS connects to a USB Type-C interface, receiving the input power voltage Type-C Power and converting it into the main power supply voltage VPH required by the system and the battery voltage VBAT required by the battery. The buck charging integrated module's system voltage output port VSYS and battery port BAT connect to the system and battery respectively, transmitting the main power supply voltage VPH and battery voltage VBAT to the system and battery to power them. The system includes multiple functional modules, such as a power management module, sensor module, communication module, touch and button module, audio module, and display module.

[0044] like Figure 2 As shown, because the buck charging module is integrated on the right temple and the battery and some functional modules are integrated on the left temple, two power supplies, namely the main power supply voltage and the battery voltage, run simultaneously on the flexible circuit board. Due to the large width of the power traces, each power trace typically occupies one layer of the flexible circuit board, leading to an increase in the number of layers and hindering the development of flexible circuit boards towards thinner and narrower designs.

[0045] To this end, this application proposes a charging circuit, including a voltage conversion module, a buck charging integrated module, and power traces located in a flexible circuit board. The voltage conversion module can convert the input power supply voltage into the main power supply voltage required by the system, and transmit the main power supply voltage to the system and the buck charging integrated module through the power traces. The buck charging integrated module converts the main power supply voltage into the battery voltage required by the battery, thereby realizing the power supply to the system and the battery.

[0046] Compared to the existing two power supply traces, by adding a voltage conversion module, only one power supply trace needs to be set between the output of the voltage conversion module and the bus voltage input port of the buck charging integrated module, thereby reducing the number of power supply traces in the flexible circuit board and reducing the number of layers of the flexible circuit board.

[0047] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0048] Figure 3 The schematic diagram of the charging circuit provided in this application is as follows: Figure 3 As shown, the charging circuit includes:

[0049] Voltage conversion module 101, buck charging integrated module 102, and power trace 103 connected between the output terminal of voltage conversion module 101 and the bus voltage input port VBUS of buck charging integrated module 102;

[0050] The output terminal of the voltage conversion module 101 is connected to the system 201. When the input terminal of the voltage conversion module 101 receives the input power supply voltage POWER, the voltage conversion module 101 is used to convert the input power supply voltage POWER into the main power supply voltage VPH required by the system 201.

[0051] The battery port BAT of the buck charging integrated module 102 is connected to the battery 202. When the bus voltage input port VBUS of the buck charging integrated module 102 receives the main power supply voltage VPH, the buck charging integrated module 102 is used to convert the main power supply voltage VPH into the battery voltage VBAT required by the battery 202.

[0052] In this embodiment of the application, the voltage conversion module 101 includes an input terminal and an output terminal. The output terminal of the voltage conversion module 101 is connected to the system 201. When the input terminal of the voltage conversion module 101 receives the input power supply voltage POWER, the voltage conversion module 101 can convert the input power supply voltage POWER into the main power supply voltage VPH required by the system 201, and provide the main power supply voltage VPH to the system 201 through the output terminal of the voltage conversion module 101.

[0053] The power supply trace 103 in the flexible circuit board 203 is connected between the output terminal of the voltage conversion module 101 and the bus voltage input port VBUS of the buck charging integrated module 102. The power supply trace 103 only needs to transmit the main power supply voltage VPH to the bus voltage input port VBUS of the system 201 and the buck charging integrated module 102, so only one power supply trace 103 is needed.

[0054] The buck charging integrated module 102 includes a bus voltage input port VBUS and a battery port BAT. The bus voltage input port VBUS of the buck charging integrated module 102 is connected to the power supply line 103, and the battery port BAT of the buck charging integrated module 102 is connected to the battery 202. When the bus voltage input port VBUS of the buck charging integrated module 102 receives the main power supply voltage VPH transmitted by the power supply line 103, it can convert the main power supply voltage VPH into the battery voltage VBAT required by the battery 202, and provide the battery voltage VBAT to the battery 202 through the battery port BAT.

[0055] Based on this, power can be supplied to system 201 and battery 202 through one power supply line 103, thereby reducing the number of power supply lines 103 in flexible circuit board 203, reducing the number of layers in flexible circuit board 203, and thus reducing the cost of flexible circuit board 203.

[0056] For example, voltage conversion module 101 may include a DC-DC converter that can step down the input power supply voltage POWER to output the main power supply voltage VPH required by system 201.

[0057] For example, such as Figure 4 As shown, system 201 may include functional modules 2011 such as core computing module, environment perception module, display and presentation module, interactive control module, communication transmission module, and power management module.

[0058] The core computing module may include a main processor (SoC / MCU), RAM, and ROM, responsible for computation and scheduling. The environmental perception module may include an inertial measurement unit (IMU), RGB (red, green, blue) / depth cameras, light sensors, microphones, etc., responsible for collecting environmental and user data. The display module may include a near-eye display panel (Micro OLED, etc.), optical lenses, display driver circuits, etc., responsible for overlaying virtual and real content. The interaction control module may include physical buttons, a touchpad, gesture sensors, speakers, etc., responsible for receiving and responding to user actions. The communication transmission module may include Wi-Fi, Bluetooth, and a Type-C interface, enabling external data interaction. The power management module may include a buck charging integrated module, a battery, power distribution circuits, etc., providing stable power supply.

[0059] For example, the buck charging integrated module 102 may include a buck topology-based switching power supply, an integrated buck charging IC (chip), etc.

[0060] It should be noted that the main power supply voltage VPH refers to the core voltage output after conversion by the voltage conversion module 101, which provides the basic voltage for the entire system 201. The battery voltage VBAT refers to the dedicated voltage output after conversion by the buck charging integrated module 102, which provides safe and stable power supply to the battery 202.

[0061] Optionally, the buck charging integrated module 102 may also include a system voltage output port VSYS, which is connected to the power supply line 103. When the bus voltage input port VBUS of the buck charging integrated module 102 does not receive the main power supply voltage VPH, the battery port BAT of the buck charging integrated module 102 can receive the battery voltage VBAT provided by the battery 202. The buck charging integrated module 102 is used to convert the battery voltage VBAT into the main power supply voltage VPH and output the main power supply voltage VPH through the system voltage output port VSYS. Then, the main power supply voltage VPH is provided to the system 201 through the power supply line 103, so that the system 201 can be powered by the battery 202 when the device (such as AR glasses) does not have an input power supply voltage POWER.

[0062] When the bus voltage input port VBUS of the buck charging integrated module 102 receives the main power supply voltage VPH, the system voltage output port VSYS outputs the main power supply voltage VPH. That is, while the buck charging integrated module 102 is charging the battery 202, its bus voltage input port VBUS also has an output. At this time, the buck charging integrated module 102 and the voltage conversion module 101 can simultaneously supply power to the system 201.

[0063] For example, when the device's USB port is plugged into an external power source (such as a charger, computer USB port, power bank, etc.), the input terminal of the voltage conversion module 101 can receive the input power voltage POWER. The voltage conversion module 101 can convert the input power voltage POWER into a main power voltage VPH, and output the main power voltage VPH through the output terminal of the voltage conversion module 101. The main power voltage VPH output by the voltage conversion module 101 is divided into two paths: one path powers the system 201, and the other path powers the buck charging integrated module 102. Correspondingly, the buck charging integrated module 102 can convert the main power voltage VPH into a battery voltage VBAT to power the battery 202.

[0064] When the device's USB port is not plugged into an external power source, the voltage conversion module 101 does not work. At this time, the battery 202 can supply power to the battery port BAT of the buck charging integrated module 102. The buck charging integrated module 102 converts the battery voltage VBAT provided by the battery 202 into the main power supply voltage VPH, and outputs the main power supply voltage VPH through the system voltage output port VSYS. The main power supply voltage VPH is then provided to the system 201 through the power supply line 103.

[0065] Optional, such as Figure 3 and Figure 4As shown, the charging circuit also includes a switch module 104, which is connected between the power supply line 103 and the bus voltage input port VBUS of the buck charging integrated module 102. When the control terminal of the switch module 104 receives the input power supply voltage POWER, the switch module 104 is turned on to transmit the main power supply voltage VPH output by the voltage conversion module 101 to the buck charging integrated module 102.

[0066] When the input power voltage POWER is received at the input terminal of the voltage conversion module (i.e., the device's USB port is plugged into an external power source), the main power voltage VPH generated by the voltage conversion module 101 supplies power to the buck charging integrated module 102 and the system 201 through the power supply line 103. If there is no switch module 104, the output terminal of the voltage conversion module 101 is directly connected to the bus voltage input port VBUS of the buck charging integrated module 102. Then, the system voltage output port VSYS of the buck charging integrated module 102 and the system 201 are both connected to the power supply line 103. In other words, the system voltage output port VSYS of the buck charging integrated module 102 and the bus voltage input port VBUS are connected together, causing backflow.

[0067] Therefore, by adding a switch module 104 between the power supply line 103 and the bus voltage input port VBUS of the buck charging integrated module 102, the main power supply voltage VPH output by the system voltage output port VSYS can be prevented from flowing back to the bus voltage input port VBUS of the buck charging integrated module 102.

[0068] It should be noted that since the input power supply voltage POWER serves as the enable signal for the switch module 104, the switch module 104 will automatically turn on when the input power supply voltage POWER is received.

[0069] For example, the control terminal of the switch module 104 is connected to the input terminal of the voltage conversion module 101 so that the control terminal of the switch module 104 receives an enable signal. The enable signal trace is mainly used to transmit electrical signals, and its current carrying capacity is relatively small, so the trace width is relatively narrow. The power supply trace 103 needs to carry a large current, and in order to reduce the resistance of the trace and reduce power loss and heat generation, it is usually designed to be wider. Therefore, although the control terminal of the switch module 104 and the input terminal of the voltage conversion module 101 need to be provided with enable signal traces, their width is smaller than the width of the power supply trace 103, and will not have a significant impact on the number of layers of the flexible circuit board 203.

[0070] For example, the switching module 104 may include a load switch, a MOSFET, etc.

[0071] It should be noted that, typically, the width of the flexible circuit board 203 is approximately 3mm. After deducting the outer containment portion and ground loop, the remaining effective width is approximately 2.3mm. When the maximum current corresponding to the main power supply voltage output from the system voltage output terminal is approximately 2A (optical engine current 1.1A + audio amplifier current 0.4A + battery charging current 0.3A + platform current 0.2A), with sufficient margin, the power supply traces transmitting the main power supply voltage would occupy one layer of space. Based on the charging circuit of this application, by eliminating the power supply traces between the system voltage output terminal and the system, the flexible circuit board reduces its trace count by one layer.

[0072] Optionally, the charging circuit also includes a unidirectional conduction module 105. The input and control terminals of the unidirectional conduction module 105 are both connected to the system voltage output port VSYS of the buck charging integrated module 102, and the output terminal of the unidirectional conduction module 105 is connected to the power supply trace 103. When the unidirectional conduction module 105 receives the main power supply voltage VPH, it conducts to transmit the main power supply voltage VPH to the system 201. Since the control terminal and input terminal of the unidirectional conduction module 105 are both connected to the system voltage output port VSYS of the buck charging integrated module 102, the unidirectional conduction module 105 conducts unidirectionally when the system voltage output port VSYS of the buck charging integrated module 102 outputs the main power supply voltage VPH.

[0073] Without the unidirectional conduction module 105, since both the system voltage output port VSYS of the buck charging integrated module 102 and the output of the voltage conversion module 101 are connected to the power supply line 103, the output of the voltage conversion module 101 and the system voltage output port VSYS of the buck charging integrated module 102 would be connected together, easily causing the main power supply voltage VPH to flow back to the system voltage output port VSYS of the buck charging integrated module 102. By setting the unidirectional conduction module 105 between the system voltage output port VSYS of the buck charging integrated module 102 and the power supply line 103, after the buck charging integrated module 102 outputs the main power supply voltage VPH, it is supplied to the system 201 through the unidirectional conduction module 105, thus preventing the output of the voltage conversion module 101 from flowing back to the system voltage output port VSYS of the buck charging integrated module 102. The unidirectional conduction module 105 is used to control the unidirectional transmission of the main power supply voltage VPH, that is, from the system voltage output port VSYS to the power supply line 103.

[0074] Optionally, the unidirectional conduction module 105 may include a diode. The control terminal of the diode serves as the control terminal of the unidirectional conduction module 105, the anode of the diode serves as the input terminal of the unidirectional conduction module 105 and is connected to the system voltage output port VSYS, and the cathode of the diode serves as the output terminal of the unidirectional conduction module 105 and is connected to the power supply trace 103. This simple structure balances the multiple requirements of the device regarding size, power consumption, cost, and reliability.

[0075] For example, diodes may include controllable diodes, photodiodes, etc.

[0076] The charging circuit provided in this application, by adding a voltage conversion module, only requires one power trace between the output of the voltage conversion module and the bus voltage input port of the buck charging integrated module. This reduces the number of power traces in the flexible circuit board, lowers the number of layers in the flexible circuit board, and promotes the development of flexible circuit boards towards being lighter, thinner, and narrower.

[0077] This application also provides AR glasses, such as Figure 4 and Figure 5 As shown, it includes the charging circuit described above.

[0078] AR glasses are a type of wearable smart device that can integrate virtual information with the real environment in real time.

[0079] Since the above charging circuit can reduce the number of power traces 103, the number of power traces 103 in the flexible circuit board 203 can be reduced, the number of layers of the flexible circuit board 203 can be reduced, or the width of the flexible circuit board 203 can be reduced while keeping the number of layers of the flexible circuit board 203 unchanged, thereby making the flexible circuit board 203 lighter, thinner and narrower. This is reflected in the product form of AR glasses, with a smaller frame and improved user wearing experience.

[0080] Optionally, the AR glasses also include a flexible circuit board 203, on which the power traces 103 in the charging circuit are disposed. The flexible circuit board 203 is a core component connecting the main board 205 and the small board 206, enabling data transmission and power transmission between the main board 205 and the small board 206.

[0081] Optionally, the AR glasses include a USB port 204. The USB port 204 is connected to the input terminal of the voltage conversion module 101 in the charging circuit. When the USB port 204 is plugged into an external power source (such as a charger, computer USB port, power bank, etc.), the input terminal of the voltage conversion module 101 can receive the input power voltage POWER. When the USB port 204 is not plugged into an external power source, the voltage conversion module 101 does not work.

[0082] For example, USB port 204 may include Type-C, Micro-USB, etc.

[0083] It should be noted that USB port 204 is the core port for connecting AR glasses to external devices (such as mobile phones, computers, and chargers), and can handle functions such as power supply, data transmission, and expansion (connecting external displays, connecting USB flash drives). USB port 204 can be used not only as a charging port but also as a data transmission port.

[0084] Optional, such as Figure 4 and Figure 5 As shown, the AR glasses also include a motherboard 205, a voltage conversion module 101 in the charging circuit, and some functional modules 2011 of the system 201, which are mounted on the motherboard 205.

[0085] The motherboard 205 is the core control and data processing hub of the AR glasses. Key components (such as processors, memory, sensor chips, display driver chips, etc.) are soldered or connected to the motherboard 205 through interfaces to realize functions such as data processing and computing, storage and signal processing.

[0086] For example, the functional modules located on the motherboard 205 may include a core computing module, a communication transmission module, a power management module, an environmental awareness module, etc.

[0087] Optionally, the AR glasses also include a small board 206, a buck charging integrated module 102, and some functions of the system 201 are set on the small board 206.

[0088] The small board 206 is an auxiliary circuit board relative to the main board 205, which realizes functions such as integrating peripheral interfaces (such as microphone and headphones) and building auxiliary components (ambient light sensor, proximity sensor).

[0089] For example, the functional modules located on the small board 206 may include a display module, an interactive control module, etc.

[0090] Optionally, the AR glasses also include a battery 202 connected to the battery port BAT of the buck charging integrated module 102. The battery 202 is the power source for the AR glasses, providing stable power to the mainboard 205, the small board 206, etc.

[0091] Optionally, the AR glasses also include a left temple 207, a right temple 208, and a frame; a motherboard 205 and a USB port 204 are located on the right temple 208; a small board 206 and a battery 202 are located on the right temple 208; and a flexible circuit board 203 is located on the frame.

[0092] The AR glasses provided in this application reduce the number of power lines, decrease the number of flexible circuit board layers, or, while keeping the number of flexible circuit board layers unchanged, reduce the width of the flexible circuit board, thereby making the flexible circuit board lighter, thinner, and narrower. This is reflected in the product form of the AR glasses, with a smaller frame, improving the user's wearing experience.

[0093] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A charging circuit, characterized in that, include: Voltage conversion module (101); the output terminal of the voltage conversion module (101) is connected to the system (201), and when the input terminal of the voltage conversion module (101) receives the input power supply voltage, the voltage conversion module (101) is used to convert the input power supply voltage into the main power supply voltage required by the system (201); A power supply trace (103) is connected between the output terminal of the voltage conversion module (101) and the bus voltage input port of the buck charging integrated module (102). And the step-down charging integrated module (102); the battery port of the step-down charging integrated module (102) is connected to the battery (202), and when the bus voltage input port of the step-down charging integrated module (102) receives the main power supply voltage, the step-down charging integrated module (102) is used to convert the main power supply voltage into the battery voltage required by the battery (202).

2. The charging circuit according to claim 1, characterized in that, The step-down charging integrated module (102) further includes: a system voltage output port; the system voltage output port is connected to the power supply line (103). When the battery port of the buck charging integrated module (102) receives the battery voltage provided by the battery (202), the buck charging integrated module (102) is used to convert the battery voltage into the main power supply voltage, and the system voltage output port outputs the main power supply voltage; And / or, when the bus voltage input port of the buck charging integrated module (102) receives the main power supply voltage, the system voltage output port outputs the main power supply voltage.

3. The charging circuit according to claim 2, characterized in that, The charging circuit further includes a switching module (104); the switching module (104) is connected between the power supply line (103) and the bus voltage input port of the buck charging integrated module (102); When the control terminal of the switching module (104) receives the input power supply voltage, the switching module (104) is turned on to transmit the main power supply voltage output by the voltage conversion module to the step-down charging integrated module (102).

4. The charging circuit according to claim 2 or 3, characterized in that, The charging circuit further includes a unidirectional conduction module (105); the input terminal and control terminal of the unidirectional conduction module (105) are connected to the system voltage output port of the step-down charging integrated module (102), and the output terminal of the unidirectional conduction module (105) is connected to the power supply line (103). When the unidirectional conduction module (105) receives the main power supply voltage, the unidirectional conduction module (105) is turned on to transmit the main power supply voltage to the system (201).

5. The charging circuit according to claim 4, characterized in that, The unidirectional conduction module (105) includes: a diode; The control terminal of the diode serves as the control terminal of the unidirectional conduction module (105), the anode of the diode serves as the input terminal of the unidirectional conduction module (105), and the cathode of the diode serves as the output terminal of the unidirectional conduction module (105).

6. An AR glasses, characterized in that, The charging circuit includes any one of claims 1-5.

7. The AR glasses according to claim 6, characterized in that, The AR glasses also include a flexible circuit board (203), and the power supply traces (103) in the charging circuit are disposed on the flexible circuit board (203).

8. The AR glasses according to claim 7, characterized in that, The AR glasses also include a USB port (204); the USB port (204) is connected to the input terminal of the voltage conversion module (101) in the charging circuit; And / or, the motherboard (205); the voltage conversion module (201) in the charging circuit and some functional modules of the system (201) are disposed on the motherboard (205).

9. The AR glasses according to claim 8, characterized in that, The AR glasses also include: a small board (206), on which the step-down charging integrated module (102) and some functional modules of the system (201) are disposed; And / or, a battery (202) connected to the battery port of the buck charging integrated module (102).

10. The AR glasses according to claim 9, characterized in that, The AR glasses also include a left temple (207), a right temple (208), and a frame; The motherboard (205) and the USB port (204) are located on the right temple (208); The small plate (206) and the battery (202) are located on the left temple (207); The flexible circuit board (203) is located on the mirror frame.

Images